From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753243AbdDDNsz (ORCPT ); Tue, 4 Apr 2017 09:48:55 -0400 Received: from nat-hk.nvidia.com ([203.18.50.4]:7490 "EHLO nat-hk.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751092AbdDDNsx (ORCPT ); Tue, 4 Apr 2017 09:48:53 -0400 X-PGP-Universal: processed; by hkpgpgate101.nvidia.com on Tue, 04 Apr 2017 06:48:51 -0700 From: Laxman Dewangan To: , , CC: , , , Laxman Dewangan Subject: [PATCH V4 1/2] regulator: DT: Add settling time property for non-linear voltage change Date: Tue, 4 Apr 2017 18:59:49 +0530 Message-ID: <1491312590-20887-1-git-send-email-ldewangan@nvidia.com> X-Mailer: git-send-email 2.1.4 MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some regulators (some PWM regulators) have the voltage transition exponentially. On such cases, the settling time for voltage change is treated as constant time. Add DT property for providing the settling time for any level of voltage change for non-linear voltage change. signed-off-by: Laxman Dewangan Acked-by: Rob Herring --- This patch is continuation of discussion on patch regulator: pwm: Fix regulator ramp delay for continuous mode https://patchwork.kernel.org/patch/9216857/ where is it discussed to have separate property for PWM which has exponential voltage transition. Changes from V1: - Pass the flag to tell that voltage ramp is exponential instead of providing delay. Changes from V2: - Based on review comment from V1, make the settling time property independent of the regulator-ramp-delay and move this out of PWM regulator. Changes from V3: - The change was sent long back and resuming this patch. - Added Rob's ack from V3 and content is same as V3. https://lkml.org/lkml/2016/11/30/632 - Rebase on linux-next tag 20170330 for resend. --- Documentation/devicetree/bindings/regulator/regulator.txt | 3 +++ 1 file changed, 3 insertions(+) diff --git a/Documentation/devicetree/bindings/regulator/regulator.txt b/Documentation/devicetree/bindings/regulator/regulator.txt index 6ab5aef..d18edb0 100644 --- a/Documentation/devicetree/bindings/regulator/regulator.txt +++ b/Documentation/devicetree/bindings/regulator/regulator.txt @@ -21,6 +21,9 @@ Optional properties: design requires. This property describes the total system ramp time required due to the combination of internal ramping of the regulator itself, and board design issues such as trace capacitance and load on the supply. +- regulator-settling-time-us: Settling time, in microseconds, for voltage + change if regulator have the constant time for any level voltage change. + This is useful when regulator have exponential voltage change. - regulator-soft-start: Enable soft start so that voltage ramps slowly - regulator-state-mem sub-root node for Suspend-to-RAM mode : suspend to memory, the device goes to sleep, but all data stored in memory, -- 2.1.4